From f786edfb90683ccb225ed50aeed38b6ce3c336dc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adrian=20Z=C3=BCrcher?= <zuercher@mst.local>
Date: Sun, 14 Dec 2025 21:54:13 +0100
Subject: [PATCH] update some...

---
 go.mod       |   4 ++
 go.sum       |   4 ++
 main.go      |  90 ++++++++++++++++++++++++++++++++++++++++++++-
 websocket.go | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 198 insertions(+), 2 deletions(-)
 create mode 100644 go.sum
 create mode 100644 websocket.go

diff --git a/go.mod b/go.mod
index 445e9e6..e3171ba 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,7 @@
 module test
 
 go 1.24.5
+
+require github.com/gorilla/mux v1.8.1
+
+require github.com/gorilla/websocket v1.5.3
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..7ed87b7
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,4 @@
+github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
+github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
diff --git a/main.go b/main.go
index 056d75a..16cb63c 100644
--- a/main.go
+++ b/main.go
@@ -1,7 +1,93 @@
 package main
 
-import "fmt"
+import (
+	"flag"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/gorilla/mux"
+)
 
 func main() {
-	fmt.Println("hello from go")
+	port := flag.Uint("port", 9401, "listening port")
+	flag.Parse()
+
+	router := mux.NewRouter()
+
+	router.HandleFunc("/start", start)
+	router.HandleFunc("/stop", stop)
+	router.HandleFunc("/status", state)
+	router.HandleFunc("/ws", websocketHandler)
+
+	http.Handle("/", router)
+	http.ListenAndServe(fmt.Sprintf(":%d", *port), nil)
+}
+
+var Prg Program
+
+func start(w http.ResponseWriter, r *http.Request) {
+	if Prg.Run {
+		w.Write([]byte("Programm already running"))
+		setState("Programm already running")
+
+		return
+	}
+	Prg.start()
+	w.Write([]byte("Program started"))
+	setState("Programm started")
+
+}
+
+func stop(w http.ResponseWriter, r *http.Request) {
+	if !Prg.Run {
+		w.Write([]byte("Programm already stopped"))
+		setState("Programm already stopped")
+
+		return
+	}
+
+	Prg.stop()
+	w.Write([]byte("Program stopped"))
+	setState("Programm stopped")
+
+}
+
+func state(w http.ResponseWriter, r *http.Request) {
+	if !Prg.Run {
+		w.Write([]byte("Programm stopped"))
+		setState("Programm stopped")
+		return
+	}
+
+	w.Write([]byte(Prg.State))
+}
+
+type Program struct {
+	Run   bool
+	State string
+}
+
+func (p *Program) start() {
+	if p.Run {
+		return
+	}
+
+	go func() {
+		p.Run = true
+		counter := 0
+		for p.Run {
+			counter++
+			if counter > 100 {
+				counter = 0
+			}
+			p.State = fmt.Sprintf("Hello, Go! :%d", counter)
+			setState(fmt.Sprintf("Hello, Go! :%d", counter))
+			time.Sleep(time.Second)
+		}
+	}()
+}
+
+func (p *Program) stop() {
+	p.Run = false
 }
diff --git a/websocket.go b/websocket.go
new file mode 100644
index 0000000..15733f0
--- /dev/null
+++ b/websocket.go
@@ -0,0 +1,102 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+// WebSocket upgrader
+var upgrader = websocket.Upgrader{
+	ReadBufferSize:  1024,
+	WriteBufferSize: 1024,
+	// Allow all origins (CORS)
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+}
+
+var (
+	clients   = make(map[*websocket.Conn]bool)
+	clientsMu sync.Mutex
+
+	appState   = "idle"
+	appStateMu sync.Mutex
+)
+
+func websocketHandler(w http.ResponseWriter, r *http.Request) {
+	conn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Println("WebSocket upgrade error:", err)
+		return
+	}
+	defer conn.Close()
+
+	// Register client
+	clientsMu.Lock()
+	clients[conn] = true
+	clientsMu.Unlock()
+
+	log.Println("Client connected")
+
+	// Optionally send initial state
+	sendStateToClient(conn)
+
+	for {
+		_, _, err := conn.ReadMessage()
+		if err != nil {
+			break
+		}
+		// (Ignore incoming messages — or handle if needed)
+	}
+
+	// Remove client on disconnect
+	clientsMu.Lock()
+	delete(clients, conn)
+	clientsMu.Unlock()
+
+	log.Println("Client disconnected")
+}
+
+func setState(newState string) {
+	appStateMu.Lock()
+	defer appStateMu.Unlock()
+
+	if appState != newState {
+		appState = newState
+		//log.Printf("State changed to: %s", newState)
+		broadcastState()
+	}
+}
+
+func broadcastState() {
+	clientsMu.Lock()
+	defer clientsMu.Unlock()
+
+	for conn := range clients {
+		err := conn.WriteJSON(map[string]string{
+			"type":  "state_update",
+			"state": appState,
+			"time":  time.Now().Format(time.RFC3339),
+		})
+		if err != nil {
+			log.Println("Error sending to client, removing:", err)
+			conn.Close()
+			delete(clients, conn)
+		}
+	}
+}
+
+func sendStateToClient(conn *websocket.Conn) {
+	appStateMu.Lock()
+	defer appStateMu.Unlock()
+
+	conn.WriteJSON(map[string]string{
+		"type":  "state_update",
+		"state": appState,
+		"time":  time.Now().Format(time.RFC3339),
+	})
+}